You can now store a palette of copied blocks, similar to the single-tile mini-palettes introduced in v2.4. To store the current clipboard, press Ctrl+Alt+Up and select a slot, using the mouse or the numeric keypad. To retrieve a clipboard slot into the active clipboard, press Ctrl+Alt+Down and select a filled slot. There are menu items under Edit to call up the clipboards palette in either mode. Copied blocks are persisted in the project file. Extensions now have access to the current clipboard through a new API property, $Abiathar.Clipboard in PSThar.

The simultaneous tileset is now zoomable. You can zoom the simultaneous tileset! Rejoice. (Abiathar has existed for four years and I only got around to this now, sorry about that.) To adjust the tileset zoom level, mouse over the tileset and press the plus or minus button on your keyboard. The maximum tileset zoom is 32 pixels per tile, since anything larger would cover pretty much the entire level, defeating the purpose of a simultaneous tileset. Unfortunately, the zoom slider had to go; there wasn't a good way to make sense of it with two potentially different zoom levels. The zoom level label is pretty helpful and is adapted to this, though!

The cut mode of the Copier (engaged when right-clicking or right-dragging) now only deletes active planes instead of both active and locked ones. It still copies locked planes, though.

If you want to keep the selected tile crosshairs always visible on the tile palette (even when copying), you can enable the new "show selected tile crosshairs regardless of current tool" on the Tools tab of the Configuration window.

Simultaneous Tileset now stays enabled after opening a different project in the same Abiathar run. (It going away on subsequent project loads was a bug introduced in v2.10.)

The project-saved-with-newer-version warning now appears on top of the splash screen (instead of getting covered up by it) when dragging an ADEPS file onto Abiathar.

Nisaba is now listed as a contributor in Help | About. Thanks, Nisaba!

You might have received e-mails from various software vendors informing you that their auto-updater is broken and that you need to manually download the newest version to keep getting updates. This seems to be caused by a strange .NET Framework SSL/TLS protocol default combined with recent tightenings-up of web transport security by at least one major hosting provider. Abiathar is also affected -- previous versions will not be able to auto-update. v2.11 should be able to detect all future versions, but to get v2.11, you'll need to download a ZIP:

The Level Inspector will now warn you if it determines that you've probably used the wrong sort of switch (foreground/bridge vs. infoplane/goplat) for the target. It will also warn you if you forget to put a link on a switch.

As suggested by Nisaba, the Resource Accountant can now tell you how many of each kind of item (e.g. "1000 Points" or "5 Ammo") are in the level. To avoid cluttering up the normal results window, this behavior is opt-in: check "Resource Accountant: count items by item type" on the Tools tab of the Configuration window to enable it.

The vertical lines in the selected tile crosshairs now scroll with the tileset instead of sticking at the top.

When Abiathar first opens the New Project Wizard, it generates the default configurations and tries to save those to disk in order to save time on subsequent runs. I suspect that it's unable to write to its own directory in Program Files (since that generally requires administrative permissions) and therefore crashes when it tries to save the file. I usually keep copies of Abiathar in my mod folders and run from there - maybe try that? If it still crashes there, it should at least be able to save an error log.